The correct answer is B. Fox.
An ass is a donkey, which is often seen as a symbol of stupidity or stubbornness. A fox, on the other hand, is known for its cunning and intelligence. This is why the answer to the question “Timid : Ass :: Cunning : ?” is B. Fox.
The other options are not as good matches for the question. An ant is a small insect that is often seen as a symbol of hard work and determination. A rabbit is a small mammal that is often seen as a symbol of fertility and innocence. A horse is a large mammal that is often seen as a symbol of power and strength.
While all of these animals have their own unique characteristics, none of them are as closely associated with cunning as the fox. This is why the answer to the question “Timid : Ass :: Cunning : ?” is B. Fox.